Castle Fairfax was built in the same location as the Bowerstone Manor. It was owned by the Fairfax Family, who had a long history themselves of mental disorders.
When Lucien Fairfax became owner, he also became Mayor of Bowerstone.
 Fable II
During the quest Childhood, Sparrow and Rose are invited to visit Castle Fairfax, wishing that they could live in a manor like it. Unfortunately for the both of them, Lucien shoots Rose, killing her, and also shoots Sparrow out a window, although she/he survives.
Castle Fairfax makes little to no significant appearances in the plot of the game, although at the end, the castle can be bought for $1 000 000 Gold and Sparrow can be declared Mayor as a result.
The Castle Fairfax is a part of Fairfax Gardens, meaning that there is no loading times travelling between the two locations. Underneath the stairs is a Demon Door.
In the main bedroom, many expensive objects can be collected, such as diamonds.